Packing for pistons.



No. 650,750. Patentad May 29, |900.

C. D. CORSER.

PACKING FOR PISTONS..

(Application led Mar. 12, 1900.)

(No Model.)

Fig. 1

Witnesses,

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CHARLES D. CORSER, OF HOL'YOKE, MASSACHUSETTS, ASSGNOP TO THE HOLYOKEMACHINE COMPANY, OF SAME PLACE.

PACKING FOR PISTONCS.

SPECIFICATION forming part of Letters Patent No. 650,750, dated May 29,1900.

Application filed March l2, 1900. Serial No. 8,300. (No model.)

To all whom it may concern:

Be it known that I, CHARLES D. CoRsER, a citizen of the United States,and a resident lof Holyoke, county of Hampden, State of Massachusetts,have invented. an Improvement in Packing for Pistons, of which thefollowing description, in connection with the accompanying drawings, isa speciiication, like letters and figures on the drawings representinglike parts.

This invention relates to pistons for the cylinders of pulp-grinders orother engines; and it has for its object the production of simple andeective means for tightening or regulating the pressure of the packingof the piston.

Figure l is a top or plan View of a piston embodying my presentinvention with the upper disk-like head of the piston removed; and Fig.2 is a partly-sectional View through the piston, the heads thereof andthe packingrings being shown in section, as is also a portion of thecylinder-wall.

I have herein shown the piston as comprising two metal disk-like heads AA', the latter being provided with ahub A2- to receive the piston-rod P,Fig. 2, and support the head A, the piston-rod being shouldered, as at19, and threaded at p' to receive a nut p2, by which the heads areretained on the piston-rod. A packing-ring or a series of rings R of anysuitable construction is interposed between the heads, at the peripherythereof, to project beyond the same and engage the Walls of the cylinderC, Fig. 2. Inside the packing I interpose an expanding device, shown asa split ring I3, bearing against the inner circumference of andsupporting the packing and substantially equal in width to the distancebetween the piston-heads to thoroughly back up the packing, said ringhaving near its ends inturned abutments b b' to be engaged by acontrolling-cam CX, fulcrumed at cX on the head A', near itscircumference, andprovided with high portions c c', coperating,respectively, with the abut-ments b b.

The hub A2 is shown as provided with a lateral ear d, having a threadedhole therein to receive'a screw-stud d, one end of which is shown asbearing against a bow-spring s, mounted in a longitudinal recess in anarm C', secured to or forming a part of the cam CX, the long arm givinga powerful leverage. A check-nut ZX may be employed, if desired, to lockthe stud d in adjusted position. By rotating the stud d to swing the armC' in the direction of arrow 10, Fig. l, the controllingcam will beturned to separate the ends of the expander B, enlarging its diameterand forcing the packing R outward to the desired extent, the spring sproviding a certain slight yield or elasticity for the pressure exertedon the packing.

It is necessary in the construction shown to remove the head A when thepressure is to be adjusted; but this is readily effected.

The means for tightening the packing is simple,very strong and d urable,and effective.

Having fully described my invention, what Iclaim, and desire to secureby Letters Patent, is*

l. A piston having separated, disklike heads one of which is providedwith a central hub, to support the other head, annular packinginterposed between the heads at their periphery, an annular expanderbetween the heads and bearing against the inner circumference of thepacking, a controlling-cam for the expander, fulcrumed on one of theheads and having a rigidly-connected lever-arm, and means carried by thehub to act upon the arm and adjust the angular position of the cam.

2. A piston having separated, disk like heads one of which is providedwith a central hub, having a threaded ear, annular packing interposedbetween said heads at their periphery, an annular expander to bearagainst the inner circumference of the packing and provided at its endswith abutments, a controlling-cam fulcrumed on one of the heads betweenand to act on said abutments, said cam having an attached lever-arm, anda screw-stud mounted in the ear and adapted to coperate with the freeend of said arm, to effect the rotative movement of the cam.

3. A piston having separated, disk-like heads one of which is providedwith a central hub hav-ing a threaded ear, annular packing interposedbetween said heads at their periphery, an annular expander to bearagainst the'inner circumference of the packing and provided at its endswith. abutments, a con- IOO trolling-cam fulcrulned on one of the headsbetween and to act on said abutments, said cam having an attachedlever-arm, a spring on the lever-arm, and a screw-stud mounted in thethreaded ear and adapted to engage the spring, to operate the cam andprovide for a yielding outward pressure on the packing.

4. A piston having separated, disk -like heads one of which is providedwith a central hub, to support the other head, ann ular packinginterposed between the heads at their periphery, an annular expanderbetween thc heads and bearin gagainst the inner circum fer-

